CVE-2026-98309Public exploit

Kernel use-after-free via orphaned output polling

Published Oct 6, 2026 · Updated Oct 6, 2026

Use-after-free in the Linux Kernel vc4 DRM driver allows local users with module-management privileges to trigger a stale device access after unbind. The vc4_kms_load() function starts connector output polling without matching cleanup, so delayed work dereferences a freed drm_device after the vc4 module is removed. The demonstrated trigger uses vc4 module loading and unloading on supported Raspberry Pi graphics hardware; the published evidence shows KASAN use-after-free reports, not a demonstrated privilege gain or remote path.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 20, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel vc4 DRM driver allows local users with module-management privileges to trigger a stale device access after unbind. The vc4_kms_load() function starts connector output polling without matching cleanup, so delayed work dereferences a freed drm_device after the vc4 module is removed. The demonstrated trigger uses vc4 module loading and unloading on supported Raspberry Pi graphics hardware; the published evidence shows KASAN use-after-free reports, not a demonstrated privilege gain or remote path.

The record

CVE
CVE-2026-98309
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
Linux Foundation
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.4
  2. Affected versionversion=c8b75bca92cbf064b9fa125fc74a85994452e935 <073a30d75f309812ed61af134f24ffef4107b13a
  3. Affected versionversion=c8b75bca92cbf064b9fa125fc74a85994452e935 <7f9780df677370a19b4ec9764f13b1b82073e0d9
  4. Affected versionversion=c8b75bca92cbf064b9fa125fc74a85994452e935 <b6beee927e7f4e3142032ff91b2d0417cdddc0f6
  5. Affected versionversion=c8b75bca92cbf064b9fa125fc74a85994452e935 <cf0c4432bda37b02e7d430ff5017228ceb7caf0c
  6. Affected versionversion=c8b75bca92cbf064b9fa125fc74a85994452e935 <ee507691c18f9fee5d4751e295ab9a7ff31d59ae

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Linux Foundation · Linux Kernelversion=4.4; version=c8b75bca92cbf064b9fa125fc74a85994452e935 <073a30d75f309812ed61af134f24ffef4107b13a; version=c8b75bca92cbf064b9fa125fc74a85994452e935 <7f9780df677370a19b4ec9764f13b1b82073e0d9; version=c8b75bca92cbf064b9fa125fc74a85994452e935 <b6beee927e7f4e3142032ff91b2d0417cdddc0f6; version=c8b75bca92cbf064b9fa125fc74a85994452e935 <cf0c4432bda37b02e7d430ff5017228ceb7caf0c; version=c8b75bca92cbf064b9fa125fc74a85994452e935 <ee507691c18f9fee5d4751e295ab9a7ff31d59ae

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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